The England under-21 international has had a prolific season for the Seasiders, contributing 18 goals and 12 assists in the current Championship campaign.
The winger was in popular demand in January and Goal.com confirmed that Reading had tabled an £8 million bid for the 21-year-old, only to be unsuccessful.
Ince picked up the Championship Young Player of the Year award last month and his manager believes he should be valued higher than Zaha, who signed for the Red Devils for £15 million in January.
"If you're talking £15m for Zaha, Thomas has got to be £25m. If you compare the two, Thomas should cost more," Ince told BBC Radio Lancashire.
"Zaha is a fantastic player, don't get me wrong. Zaha's a stronger runner and does a lot of tricks, whereas Thomas is more direct, he makes things happen and he scores goals.
"You've got a kid playing in the Championship who has scored 18 goals. When you look at the leading scorers, they're all strikers, and he's there amongst them.
"Potentially, I think he can reach that value. If Palace want £15m for Zaha who has scored six goals, it makes you wonder what price he's going to be.
"You're not going to get it because he's not proven in the Premier League, but if United are paying £15m for Zaha, on the stats you'd have to say Thomas is worth a lot more than that. That's my opinion."